26
votes
12answers
5k views

How secure are passwords made of whole english sentences

I often read as an advice to build strong passwords, just to think about a sentence and then take the initial letters. For example take a nonsense sentence like "I watch Grey's Anatomy at 9.40" gives ...
0
votes
0answers
41 views

Creating a VLAN seperating home network and server - security issues? [duplicate]

Possible Duplicate: Why do people tell me not to use VLANs for security? After my host of my vServer crashed his infrastructure (takes up to two weeks to get it back online!!!), I decided ...
56
votes
2answers
46k views

Is it a bad idea for a firewall to block ICMP?

This question was inspired by this answer which states in part: The generic firewall manifest file finishes off by dropping everything I didn't otherwise allow (besides ICMP. Don't turn off ICMP). ...
0
votes
1answer
863 views

QR code as certificate of authenticity

I need details about QR code that provides information about whether its product is original or not. The situation is a stamp that tells that this product has been certified as safe to be use by this ...
5
votes
2answers
9k views

Privacy implications of IDFA/IDFV? (iPhone/iOS)

Apparently, iOS 6 introduced IDFA, "identifier for advertisers", which identifies your device so that advertisers can track you and send you ads. It appears they also introduced IDFV, "identifier for ...
9
votes
1answer
490 views

Can all the (other) recepients of a PGP encrypted message be identified?

Does an encrypted message contain any information about whom it is encrypted to, or at least to how many recipients? And if so, is it at least only obtainable for other recipients or for just anybody? ...
2
votes
3answers
2k views

Using an IPS as an alternative to mod_security

I am considering deploying mod_security as an addition to our web infrastructure. I am worried about the increased load however as these servers get a lot of hits. I am considering using IPS's such ...
3
votes
3answers
134 views

Can the root of a system access to unencrypted data when using a double tunnel?

I connect to a DMZ gateway system (B) which is not secured. From this machine (B) I can connect to the final destination (C). A-->B-->C I created a ssh tunnel from A to B and forwarding the port 22 ...
0
votes
2answers
257 views

Analyzing SSL encryption

I have to analyze SSL encryption in my test network and want to prove the transported data is encrypted. What methods can I use to prove encryption is in place?
5
votes
2answers
896 views

Is it good practice to manually lock down ports on each host

We have a strong perimeter firewall. Would it make sense to still use IPTables on each host to hard block any and all ports except for the ones that are needed (DNS, 80 for the web server, nagios ...
0
votes
1answer
180 views

Proxy Non-HTTPS logins through EC2

I've been thinking a lot about password security these days, and have been becoming more and more hesitant to use services that have login forms that are not on HTTPS. As I was researching security, ...
1
vote
3answers
536 views

Should I use a Firefox master password or NTFS encrypt my profile?

As a follow-up to another question, is the encryption via Firefox' master password more secure than simply NTFS encrypting the profile folder? I.e. is there a convincing reason to add the ...
5
votes
3answers
4k views

Where does StartSSL generate the cerificate, server or client-side?

I.e. do really only I have the private key or do I have to trust that StartSSL (or any other provider) don't store it themselves?
1
vote
0answers
261 views

Verifying Authenticode signed executables and DLLs using OpenSSL API [closed]

I have installed openssl and now the rsa_test.c is running fine. What I want to do is: Open any exe or dll digital certificate. Extract the Thumbprint and PublicKey. The public key contains the ...
4
votes
2answers
2k views

How does Firefox securely store my SSL certificate?

I'm currently testing a free personal SSL certificate (S/MIME client / authentication) from https://www.startssl.com, which installed directly into Firefox. Now when I store backup, I have to enter a ...
5
votes
2answers
2k views

Do Client Nonces enhance the security of HTTP Digest Auth?

As far as I understand the answer at http://security.stackexchange.com/a/3024/13447, client nonces are meant to prevent attackers from amortizing the costs of brute-force hash computations by being ...
4
votes
1answer
852 views

Are SSH packets encrypted even before new keys are sent?

What format does SSH use to exchange (encrypted / plain) packets before new keys are derived? SSH Document says that after key exchange, client and server use negotiated algorithm to encrypt the ...
2
votes
1answer
221 views

is root@localhost the same as Unix root with GUID = 0 and ID = 0?

Is a Mysql root user (root@localhost) the same as the computer root account (GUID = 0, ID = 0) ? I mean, is it the root which is executing the script? How can I know if the users are the same?
2
votes
3answers
1k views

A String that if encrypted or decrypted with the same key gets an English word/statement in both cases

I am trying to find a string S that if encrypted using a Vigenère cipher with Key K, it gets an English statement/word that makes sense. Additionally, if the same string S is decrypted using Vigenère ...
2
votes
2answers
491 views

Enterprise IDS - Deployment & Uses

I am investigating deploying the Snort IDS for an enterprise environment. This environment consists of a NOC that manages several servers, mainly internal but some internet facing. There are several ...
0
votes
1answer
188 views

Please define “Carpet Bombing”

I saw a 2008 article about a certain vulnerability in WebKit which referred to "Carpet Bombing": https://www.cert.org/blogs/certcc/2008/09/carpet_bombing_and_directory_p.html (This vulnerability is ...
1
vote
1answer
925 views

cracking MD5 with salt using JTR

In a legal, learning context at school, we have to understand security in Linux in the /ect/shadow file and the anaconda-ks.cfg. These two files contains often different kind of hash and the password ...
18
votes
1answer
868 views

Doing a dictionary attack on RSA if you have the public key?

I'm trying to learn exactly how RSA works. Currently I have a very, very simplictic overview that goes like this. Having the public key allows you to encrypt things. Encrypting the same message ...
1
vote
1answer
290 views

Where are located the DPAPI BLOBS and is there any tool to decypher them?

I'm doing some testing with DPAPI for a project where I'm involved. I would like to know where the users Masterkey are located and if there is any free utility to find and decipher them. I'm pretty ...
7
votes
2answers
6k views

How safe is the ownCloud encryption in a trusted LAN?

ownCloud looks like a promising locally hosted dropbox alternative. However, it has been pointed out that the encryption is not exactly strong... (The ownCloud team does at least provide a list of ...
3
votes
1answer
548 views

Base64 encode diffences in BCrypt implemenations

I was reading the source code of several BCrypt implementations and found that two common c implementations have a difference in their base64 encoding of for the salt. What is the effect, if any, of ...
5
votes
1answer
313 views

Does DPAPI works if a user hasn't a login password?

I was wondering if the DPAPI will still work properly if a user doesn't have a a login password (like most of the home users). I can't find this information on Google or in the official documentation ...
1
vote
0answers
1k views

Why do complex viruses tend to be written in assembly? [closed]

For example Simile is extremely complex and is written in assembly. If something is going to be complicated isn't it best NOT to write it in assembly?
3
votes
8answers
45k views

How to block some websites in a small office?

I had a wireless connection in my office with one laptop. Now I bought two more laptops for my employees, and I give them Internet access. I want to block a few websites. My current connection is ...
-2
votes
1answer
164 views

Need help finding out what type of url encoding is this? [closed]

I need to know what type of encoding is involved in this url string: ...
6
votes
2answers
487 views

Does anyone use XML Encryption?

The XML standard defines a mechanism for encrypting the data in a XML document. It's part of the standard. Does anyone use this XML encryption format? Are there any significant deployed systems ...
6
votes
3answers
6k views

What key does Linux use when storing user passwords?

Linux typically stores user names and password hashes in /etc/passwd or /etc/shadow. Now lets say I have an old CentOS distro and I want to attempt to recover a user's password (it's in a legal, ...
2
votes
4answers
572 views

Plausible deniability for phones

I have sensitive data on my computers and phones. I use Trycrypt's plausible deniability system on my computers. When law enforcement/border patrol or my spouse asks for access I type in the password ...
8
votes
11answers
3k views

How to easily remember lots of different passwords?

I know that you shouldn’t use the same password on every site. But, when you log into several dozen sites, keeping track of all the passwords can be pretty hard. What system do you recommend that ...
6
votes
2answers
896 views

ASN.1: ENUMERATED vs INTEGER

From the X.509 specs: CRLReason ::= ENUMERATED { unspecified (0), keyCompromise (1), cACompromise (2), affiliationChanged (3), ...
2
votes
2answers
536 views

A security checklist for choosing an internet hosting service provider for a virtual private server?

I am in the process of choosing an internet hosting service provider for my website. Besides looking at the reputation of the hosting provider through internet forums, is there a more concrete way of ...
5
votes
6answers
904 views

Could a computer program be used to automate testing for trapdoors?

Could a computer program given the source or object version of another program be used to automate testing for trapdoors/backdoors?
2
votes
2answers
764 views

Is a password easier to brute force if it contains a repeating pattern?

My question is different from this previous question: Does repeating one word to form a password result in a similar pattern in its encrypted format?. I'm specifically wondering about brute force ...
3
votes
2answers
2k views

What are the implications of adding a self signed certificate to the Windows Trusted Root Certification Authorities store?

I'm a budding website developer, so please bear with my ignorance. Say I had to encrypt my website with HTTPS and I got sick of having to click "Continue" every time a warning came up about an ...
-1
votes
3answers
530 views

How information in an access log could be used to identify the true identity of an impostor?

Is it possible to use information in an access log to identify the true identity of an impostor who has acquired unauthorized access to a computing system (Perhaps by combining several different ...
4
votes
4answers
2k views

Is there any processor that could decrypt encrypted data and machine instructions?

Is there any processor that could decrypt encrypted data and machine instructions and then execute the instructions on the data then encrypt the results?
3
votes
3answers
180 views

How to know if its the same User?

I asked a question awhile ago asking how to make an efficient encrypted chatroom. What I ended up doing was Making each user generate a 4096 bit RSA KeyPair, share their public Keys, and then one of ...
2
votes
2answers
532 views

Why wouldn't the reverse shell connect back using the same port that exploited the server?

The reverse shell payload from msf use a new port to connect back to the attacker, therefore if the target server has outgoing filters, attack would fail. i.e established server:ftp <-> ...
1
vote
0answers
352 views

MySQL Database Activity Monitoring Solutions [closed]

We are looking for a DAM solution for MySQL. There is of course GreenSQL but it seems to lack some of the features we desire like robust filtering of reports for export purposes, etc. It's very ...
4
votes
1answer
5k views

Nmap scan produces all “unknown”

I scanned both localhost, and the IP address of the LAN adapter, and this is the produced output. Starting Nmap 5.51 ( http://nmap.org ) at 2012-10-12 18:06 Eastern Daylight Time Skipping SYN Stealth ...
5
votes
1answer
121 views

How to determine level of security required for this kind of site?

Here are the main areas of the site that could become a security concern: The site works as a general ledger system against the company and its users. The ledger system is to keep track of small ...
-4
votes
1answer
406 views

What are the technial and programming requirements for writing a stealth keylogger? [closed]

I'm planning to write/code one such stealth keylogger that would bypass detection by a certain antivirus. (I don't want to name the vendor as I know how good Google queries are against StackExchange ...
5
votes
2answers
2k views

How would I go about rebuilding the IAT of a packed executable?

When executables are packed with a tool such as UPX, the real code and data sections are encrypted or obfuscated, then loaded into memory using an injected decrypter stub. This makes static analysis ...
3
votes
2answers
412 views

Wi-fi security using WPA or WEP

In current years we have used WPA and WPA 2 for the encryption of data sent over an 802.11 network. But in the past WEP is used . From time to time, many people say that WEP (Wired Equivalent Privacy) ...
3
votes
1answer
593 views

How do you analyze the data collected from honeypot software?

So you've successfully setup a honeypot. GREAT! Now what?! I've got all this amazing data but; How do you analyze all the data collected from your honeypot software? What should you be looking for? ...

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